EPA Proposes to Restrict Use of N-Methylpyrrolidone

Multiple occupational uses of n-methylpyrrolidone (NMP) would be banned and others would be restricted under a proposed rule published by EPA on June 14, 2024.  The proposed rule follows EPA’s 2020 determination that NMP presents an unreasonable risk to human health due to health effects including fetal death and reduced fertility.

According to the proposed rule, NMP is a widely used solvent with applications in the manufacturing of lithium-ion batteries, “semiconductors, polymers, petrochemical products, paints and coatings, and paint and coating removers.”  2020 Chemical Data Reporting rule data indicates that total annual production ranged from 100–250 million pounds from 2016 to 2019, EPA says.

The proposed rule would ban the manufacture, processing, distribution, and use of NMP for industrial and commercial use in lubricants, anti-freeze products, automotive care products, and cleaning products, among others.  All industrial and commercial uses not prohibited would be subject to a workplace chemical protection program (WCPP) to minimize direct dermal contact with NMP through incorporation of the hierarchy of controls.  Where controls are insufficient, EPA proposes to require implementation of a PPE program.

The proposed rule would also implement prescriptive controls for certain industrial and commercial uses, such as capping the allowed concentration of NMP in industrial and commercial paints and stains at 45%. Similar concentration maximums would apply to a handful of consumer products, including adhesives.

Although no consumer products would be banned, EPA proposes to implement container size limitations and labelling requirements for some consumer uses, including paint removers, paints, automotive care products, and cleaning products.

EPA proposes that the bans take effect under a staggered schedule, varying from one to two years after publication depending on whether an entity is a manufacturer, processor, distributor, or user of NMP.  Private entities subject to WCPP requirements would have one year to establish the program, and consumer product container size limitations and labelling requirements would also take effect after one year.

Comments on the proposed rule are due on July 29, 2024.